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Thread: Differences in crc

  1. #1
    dBpoweramp Enthusiast
    Join Date
    Aug 2008
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    167

    Differences in crc

    Good day,

    Please could you explain why for the same CD ripped on 3 differents CD drives, I have not the same result ?
    Why it is mentionned " AccurateRip Verified Confidence 31 [CRCv1 c8e33135], Using Pressing Offset -599" on two of them and not on the Plextor PX-230A ?
    For you what is the best CD drive to use ?



    dBpoweramp Release 16.1 Digital Audio Extraction Log from mardi 15 novembre 2016 19:46

    Drive & Settings
    ----------------

    Ripping with drive 'F: [PLEXTOR - CD-R PX-230A ]', Drive offset: 738, Overread Lead-in/out: No
    AccurateRip: Active, Using C2: No, Cache: 1024 KB, FUA Cache Invalidate: No
    Pass 1 Drive Speed: Max, Pass 2 Drive Speed: Max
    Bad Sector Re-rip:: Drive Speed: Max, Maximum Re-reads: 34

    Encoder: FLAC -compression-level-8 -verify

    Extraction Log
    --------------

    Track 1: Ripped LBA 0 to 21417 (4:45) in 0:15. Filename: D:\Ma musique\David Bowie\Heathen (Disc 1) PX230A\01 Sunday.flac
    AccurateRip: Accurate (confidence 200) [Pass 1]
    CRC32: 704564F7 AccurateRip CRC: CDCE28F4 (CRCv2) [DiscID: 012-0017931a-00dd26d3-bc0d7e0d-1]
    AccurateRip Verified Confidence 200 [CRCv2 cdce28f4]
    AccurateRip Verified Confidence 200 [CRCv1 65b6797f]
    AccurateRip Verified Confidence 200 [CRCv2 cdce28f4]
    AccurateRip Verified Confidence 200 [CRCv1 65b6797f]

    Track 2: Ripped LBA 21417 to 34527 (2:54) in 0:07. Filename: D:\Ma musique\David Bowie\Heathen (Disc 1) PX230A\02 Cactus.flac
    AccurateRip: Accurate (confidence 200) [Pass 1]
    CRC32: CB205191 AccurateRip CRC: BE191D20 (CRCv2) [DiscID: 012-0017931a-00dd26d3-bc0d7e0d-2]
    AccurateRip Verified Confidence 200 [CRCv2 be191d20]
    AccurateRip Verified Confidence 200 [CRCv1 5b68823b]
    AccurateRip Verified Confidence 200 [CRCv2 be191d20]
    AccurateRip Verified Confidence 200 [CRCv1 5b68823b]

    ************************************************** ***********

    dBpoweramp Release 16.1 Digital Audio Extraction Log from mardi 15 novembre 2016 19:34

    Drive & Settings
    ----------------

    Ripping with drive 'G: [ATAPI - iHAS124 F ]', Drive offset: 6, Overread Lead-in/out: No
    AccurateRip: Active, Using C2: No, Cache: 1024 KB, FUA Cache Invalidate: No
    Pass 1 Drive Speed: Max, Pass 2 Drive Speed: Max
    Bad Sector Re-rip:: Drive Speed: Max, Maximum Re-reads: 34

    Encoder: FLAC -compression-level-8 -verify

    Extraction Log
    --------------

    Track 1: Ripped LBA 0 to 21417 (4:45) in 0:30. Filename: D:\Ma musique\David Bowie\Heathen (Disc 1)\01 Sunday.flac
    AccurateRip: Accurate (confidence 200) [Pass 1]
    CRC32: 704564F7 AccurateRip CRC: CDCE28F4 (CRCv2) [DiscID: 012-0017931a-00dd26d3-bc0d7e0d-1]
    AccurateRip Verified Confidence 200 [CRCv2 cdce28f4]
    AccurateRip Verified Confidence 200 [CRCv1 65b6797f]
    AccurateRip Verified Confidence 74 [CRCv2 11319b50], Using Pressing Offset -599
    AccurateRip Verified Confidence 31 [CRCv1 c8e33135], Using Pressing Offset -599

    Track 2: Ripped LBA 21417 to 34527 (2:54) in 0:17. Filename: D:\Ma musique\David Bowie\Heathen (Disc 1)\02 Cactus.flac
    AccurateRip: Accurate (confidence 200) [Pass 1 & 2]
    CRC32: CB205191 AccurateRip CRC: BE191D20 (CRCv2) [DiscID: 012-0017931a-00dd26d3-bc0d7e0d-2]
    AccurateRip Verified Confidence 200 [CRCv2 be191d20]
    AccurateRip Verified Confidence 200 [CRCv1 5b68823b]

    ************************************************** **********************************

    dBpoweramp Release 16.1 Digital Audio Extraction Log from mardi 15 novembre 2016 19:52

    Drive & Settings
    ----------------

    Ripping with drive 'E: [hp - BDDVDRW CA21N ]', Drive offset: 102, Overread Lead-in/out: Yes
    AccurateRip: Active, Using C2: Yes, Cache: 1024 KB, FUA Cache Invalidate: No
    Pass 1 Drive Speed: Max, Pass 2 Drive Speed: Max
    Bad Sector Re-rip:: Drive Speed: Max, Maximum Re-reads: 34

    Encoder: FLAC -compression-level-8 -verify
    DSP Effects / Actions: -dspeffect1="Audio CD - Hidden Track Silence Removal= -dbsilence={qt}-54{qt} -window={qt}4000{qt}" -dspeffect2="Audio CD - Silence Track Deletion= -dbsilence={qt}-54{qt}" -dspeffect3="HDCD="

    Extraction Log
    --------------

    Track 1: Ripped LBA 0 to 21417 (4:45) in 1:05. Filename: C:\Users\Thierry\Videos\David Bowie\2002 - Bowie - Heathen\01 Sunday.flac
    AccurateRip: Accurate (confidence 200) [Pass 1]
    CRC32: 704564F7 AccurateRip CRC: CDCE28F4 (CRCv2) [DiscID: 012-0017931a-00dd26d3-bc0d7e0d-1]
    AccurateRip Verified Confidence 200 [CRCv2 cdce28f4]
    AccurateRip Verified Confidence 200 [CRCv1 65b6797f]
    AccurateRip Verified Confidence 74 [CRCv2 11319b50], Using Pressing Offset -599
    AccurateRip Verified Confidence 31 [CRCv1 c8e33135], Using Pressing Offset -599

    Track 2: Ripped LBA 21417 to 34527 (2:54) in 0:36. Filename: C:\Users\Thierry\Videos\David Bowie\2002 - Bowie - Heathen\02 Cactus.flac
    AccurateRip: Accurate (confidence 200) [Pass 1]
    CRC32: CB205191 AccurateRip CRC: BE191D20 (CRCv2) [DiscID: 012-0017931a-00dd26d3-bc0d7e0d-2]
    AccurateRip Verified Confidence 200 [CRCv2 be191d20]
    AccurateRip Verified Confidence 200 [CRCv1 5b68823b]
    AccurateRip Verified Confidence 74 [CRCv2 4814163b], Using Pressing Offset -599
    AccurateRip Verified Confidence 31 [CRCv1 5b6c6477], Using Pressing Offset -599

  2. #2
    Administrator
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    Apr 2002
    Posts
    40,603

    Re: Differences in crc

    You will get different CRCs unless the drives can overread in the lead in and out, for the first and last tracks.

  3. #3
    dBpoweramp Enthusiast
    Join Date
    Aug 2008
    Posts
    167

    Re: Differences in crc

    Thanks Spoon
    So for my case, it seems that the best one is the PLEXTOR - CD-R PX-230A as all confidences are with 200, contrary to the others

    I'm right ?

    AccurateRip Verified Confidence 200 [CRCv2 cdce28f4]
    AccurateRip Verified Confidence 200 [CRCv1 65b6797f]
    AccurateRip Verified Confidence 200 [CRCv2 cdce28f4]
    AccurateRip Verified Confidence 200 [CRCv1 65b6797f]

    How to know if a CD Drive can overread lead-in / lead-out ?
    Last edited by Thg6276; 11-16-2016 at 05:19 AM.

  4. #4
    Administrator
    Join Date
    Apr 2002
    Posts
    40,603

    Re: Differences in crc

    It is not easy to test if a drive can read in or out of the lead in, you need a special audio cd with audio (not silence) right to the ends.

    A confidence of only 1 is needed if you did not previously rip that disc and submit to accuraterip.

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